Steam boiler



March 31, 1931. c. "r. CARLSON STEAM BOILER Filed June 15, 1925 eaeoao oooenooo Patented Mar. 31, 1931 UNITED STATES PATENT OFFICE CARL T. CARLSON, OF ERIE, PENNSYLVANIA, ASSIGNOR TO ERIE CITY IRON WORKS, OF ERIE, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA STEAM BOILER Application filed June 15, 1925. Serial No. 37,141.

This invention relates to steam boilers having a front and rear drum in the plane of the water level and a lower drum, these drums having a water connection with a front bank of tubes with an up-flow from the lower drum to the front drum, an upper bank of water tubes between the front drum and the rear drum with a flow from the front drum to the rear drum, and a rear bank of tubes from the rear drum to the lower drum having a downflow. The invention is designed to improve the gas passes through a boiler of this type to make the circulation in the manner described more pronounced, and in this connection preferably so arranged as to force a crossing and return crossing of the upper bank of tubes by the gases. It also involves a superheater comprising tubes having parts arranged in two passes so that said tubes are crossed and recrossed. It also involves an arrangement of the rear bank of tubes to accelerate the circulation. Other features and details of the invention will appear more fully from the specification and claims.

The invention is illustrated in the accompanying drawings as follows Fig. 1 shows a central vertical section of the boiler on the line 11 in Fig. 2.

Fig. 2 a section on the line 22 in Fig. 1.

1 marks the upper drum, 2 the lower-drum, and 3 the rear drum. The front bank of tubes 1 and la lead from the lower drum to the upper drum. An upper bank of water tubes 5 lead from the front drum to the rear.

drum. A rear bank of tubes 6 lead from the rear drum to the lower drum. Steam tubes 7 lead from the front drum to the rear drum and steam discharge tubes 8 lead from the rear drum to a chamber 9 arranged in the upper part of the front drum. A steam pipe 10 leads from the chamber 9 to a manifold 11 of the superheater, the super-heater having coils 12 extending from the manifold 11 to a manifold 13.

The furnace is surrounded by a wall 14: in which the boiler is arranged and a top wall 15. A combustion chamber 16 is directly in front of the front bank of tubes and the tubes 4 of the front bank are directly in the combustion space. A baffle 17 extends from the lower drum along the rear of the tubes between the tubes a and 4a to a point below the upper drum and a baflle 18 extends from the upper end of the baffle 17 across the tubes eta, across the tubes 12 to a bafile 19 which extends upwardly across the tubes 5. Thus the gases from the furnace extend along the tubes 1 across the entire front bank of the tubes, across the upper end of the superheater tubes, and across the tubes 5 turning in the tubes 7 and 8 and recrossingthe tubes 5.

A baffle 20 is arranged at the rear of the front bank of tubes and affects a return flow of the gases into the tubes 4a of the front bank of tubes. A baffle 21 extends from the lower end of the baflle 20 to a point above the lower drum 2. The gases passing from the lower end of the pass between the baffles 17 and 21 swing out into the tubes 6 and baffle 22 extends up the front side of the bank of tubes 6 to the rear drum 3 and makes a closure with the batlie 20. it will be noted, therefore, that there are five crossings of the tubes in this passage of gas, thus assuring uniform heat distribution and an efficient heat transference and it will also be noted that the superheater tubes are crossed twice by the gases in their pass. The feed water is delivered through a pipe 23 to the rear drum and a water drainage pipe 24 leads from the chamber 9, the end extending into one of the tubes 5 so as to have any water that may condense in the chamber 9 drawn from that chamber by the ejector effect on the end of the tube. It will be noted that the tubes 6 are all at the rear of the drum 3. This brings them in harmony with the discharge of the tubes 5 so that any movement of the liquid incident to such discharge tends to carry the water into the tubes 6. Further the hottest of the tubes 6 lead from the lowest part of the rear drum so to further the uniform flow of water through all the rear tubes.

What I claim as new is 1. In a steam boiler, the combination of a front drum; a rear drum, said drums being in the plane of the water level; a lower drum; a front bank of tubes more nearly vertical than horizontal connecting the front and lower drums; an upper bank of water tubes connecting the front and rear drums, the tubes of said upper bank being directioned to ma e the steaming direction of travel toward the rear bankof tubes; a rear bank of tubes in the connection between the rear drum and the lower drum; a combustion chamber in front of the front bank of tubes; a bafiie extending from the lower drum upwardly among the front bank of tubes dividing the front bank of tubes into front and rear sections, the front section being exposed to the direct radiant heat of the combustion chamber throughout the major portion of their lengths, the baffle terminating below the upper drum; a bafiie crossing the upper bank of tunes and leading from the front bank of tubes forming a single reverse pass through the upper bank of tubes; and means compelling the return flow of gases to pass through the lower p rtion of the rear section of the front bank of tubes, said tubes, drums and balii es coz'itrolling the temperatures and water flow to create a ring flow of water up the front bank of tubes toward the rear, through the upper bank of tubes and downwardly through the rear bank of tubes.

2. In a steam boiler, the combination of a front drum; a rear drum, said drums being in the plane of the water level; a lower drum; a front bank of tubes more nearly vertical than horizontal connecting the front and lower drums; an upper bank ofwater tubes connecting the front and rear drums, the tubes of said upper bank being directioned to make the steaming direction of travel toward the rear bank of tubes; a rear bank of tubes in the connection between the rear drum and the lower drum; a combustion chamber in front of the front bank of tubes; a battle extending from the lower drum upwardly among the front bank of-tubesdividing the front bank of tubes into front and rear sections, the front section being exposed to tire direct radiant heat of the combnstion chamber throughout the major portion of their lengths, the baffle terminating below the upper drum; a baflle crossing the upper bank of tubes and leading from the front bank of tubes forming a single reverse pass through the upper bank of tubes; and means compelling the return flow of gases to pass through the lower portion of the rear section of the front bank of tubes and from the lower end of the front bankof tubes into the lower end of the rear bank of tubes and upwardly along the rear bank of tubes, said tubes, drums and bafiles controlling the temperatures and water flow to create a ring flow of water up the front bank of tubes toward the rear, through the upper bank of tubes and downwardly through the rear bank of tubes.

8. In a steam boiler, the combination of a front drum; a rear drum, said drums being in the plane of the water level; a lower drum;

a front bank of tubes more nearly vertical than horizontal connecting the front and lower drums; an upper bank of water tubes connecting the front and rear drums, the tubes of said upper bank being directioned to make the steaming direction of travel toward the rear bank of tubes; a rear bank of tubes in the connection between the rear drum and the lower drum; a combustion chamber in front of the front bank of tubes; a battle extending from the lower drum upwardly among the front bank of tubes diriding the front bank of tubes into a front and rear section xposing the front section throughout the major portion of its length to the direct radiant heat from combustion, said batlle terminating below the front drum and crossing the upper ends of the rear section of the front bank of tubes and the upper bank of tubes; and a baffle to the rear of the front bank of tubes returning the gases from the upper bank of tubes to the lowe por tions of the rear sections of the front bank of tubes and terminating above the lower drum, said tubes, drums and baffles controlling the temperatures and water flow to create a ring flow of water up the front bank of tubes toward the rear, through the upper bank of tubes and downwardly through the rear bank of tubes.

at. In a steam boiler, the combination of a front drum; a rear drum, said drums being in the plane of the water level; a lower drum; a front bank of tubes more nearly vertical than horizontal connecting the front and lower drums; an upper bank of water tubes connecting the front and rear drums, the tubes of sai d upper bank being directioned to make the steaming direction of travel toward the rear bank of tubes; a rear bank of tubes in the connection between the rear drum and the lower drum; a combustion chamber in front of the front bank of tubes; a baffle extending from the lower drum upwardly amongthe front bank of tubes dividing the front bank of tubes into a front and rear sec tion exposing the front section throughout the major portion of its length to the direct radiant heat from combustion, said baffle terminating below the front drum and crossing the upper ends of the rear section of the front bank of tubes and the upper bank of tubes; a baflle to the rear of the front bank of tubes returning the gases from the upper bank of tubes to the lower portions of the rear sections of the front bank of tubes and terminating above the lower drum; and a baftie at the front of the rear bank of tubes lead ing from the upper drum and terminating above the lower drum, said tubes, drums and ballles controlling the temperatures and water flow to create a ring flow of water up the front bank of tubes toward the rear, through the upper bank of tubes and downwardly through the rear bank of tubes.

5. In a steam boiler, the combination of a front drum; a rear drum, said drums being in the plane of the water level; a lower drum; a front bank of tubes connecting the front drum and the lower drum; an upper bank of water tubes connecting the front and rear drums; a rear bank of tubes in a connection between the rear drum and the lower drum; a baflle extending from the front bank of tubes to the upper bank of tubes and across the upper bank of tubes; and a superheater extending through the baffle and subjected to a flow of gases as they pass to and from the upper bank of tubes.

6. In a boiler, the combination of a front drum; a rear drum, said drums being in the plane of the water level; a lower drum; a front bank of tubes connecting the front drum and lower drum; an upper bank of water tubes connecting the front and rear drums; a rear bank of tubes in a connection between the rear drum and the lower drum; a baffle extending from the lower drum upwardly in the front bank of tubes separating said bank into front and rear sections and extending across the upper ends of the rear section of the bank of tubes and across said upper tubes controlling the initial pass of gases through the front section of the front bank of tubes, across the upper portions of the front bank of tubes and with a single return bend around the upper bank of tubes; a bafile to the rear of the front bank of tubes returning the gases from the upper bank of tubes to the lower portions of the rear section of the front bank of tubes; and a superheater extending from the last-mentioned bafile through the first-mentioned bafile and into the path of gases leading toand leading from the upper bank of tubes.

In testimony whereof I have hereunto set no hand.

y CARL T. CARLSON. 

